Anemia in Pregnancy – Causes, Symptoms, Investigations, Complications Treatment Explained

Below is a **complete, concise-but-exhaustive, exam-ready medical reference** for **Anemia in Pregnancy**, following the structured pattern you prefer (definition → pathophysiology → causes → clinical features → investigations → differential diagnosis → management → drug details → monitoring → counselling).
Images included for quick visual recall.

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# **ANEMIA IN PREGNANCY — COMPLETE REFERENCE**

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## **1. Definition**

* **WHO definition during pregnancy:**

* **Hb <11 g/dL** (1st & 3rd trimester)
* **Hb <10.5 g/dL** (2nd trimester)
* **Severity (India guidelines):**

* Mild: 10–10.9 g/dL
* Moderate: 7–9.9 g/dL
* Severe: 4–6.9 g/dL
* Very severe: <4 g/dL

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## **2. Pathophysiology**

Pregnancy causes:

* **↑ Plasma volume (40–50%) → hemodilution**
* **↑ Iron demand (1000 mg total in pregnancy)**

* 300 mg fetus + 500 mg maternal RBC mass + 200 mg losses
* **Relative deficiency** occurs if intake/absorption inadequate.
* Commonest type = **Iron Deficiency Anemia (IDA)**.

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## **3. Causes**

### **A. Nutritional**

* Iron deficiency (most common)
* Folate deficiency
* Vitamin B12 deficiency

### **B. Hematological**

* Thalassemia trait / Thalassemia major
* Sickle cell disease
* Aplastic anemia

### **C. Secondary to disease**

* Anemia of chronic disease
* Malaria
* Hookworm
* Hemolytic anemia

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## **4. Clinical Features**

* Fatigue, weakness, palpitations, dyspnea
* Pallor: conjunctiva, tongue, nails
* Glossitis, angular stomatitis (in IDA)
* Pica
* Jaundice → suggest hemolysis
* Systolic murmur due to hyperdynamic circulation

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## **5. Maternal Complications**

* Preterm labor
* PPH (poor uterine muscle function)
* Cardiac failure (especially Hb <5 g/dL)
* Increased infections
* Poor lactation

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## **6. Fetal Complications**

* IUGR
* LBW
* Preterm birth
* Fetal hypoxia
* Stillbirth (severe anemia)

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## **7. Investigations**

### **A. Basic**

1. **CBC**

* Hb, Hct (PCV), RBC indices
* **MCV <80 fL → microcytic**
* **MCHC low → hypochromia**

2. **Peripheral Smear**

* IDA: microcytic, hypochromic, anisopoikilocytosis
* Megaloblastic: macro-ovalocytes, hypersegmented neutrophils

3. **Reticulocyte count**

* Low → production problem
* High → hemolysis / blood loss

### **B. Iron Studies**

| Parameter | Iron Deficiency | Anemia of Chronic disease |
| ---------------------- | --------------- | ------------------------- |
| Serum Iron | ↓ | ↓ |
| TIBC | ↑ | ↓ / normal |
| Ferritin | ↓ | ↑ |
| Transferrin saturation | ↓ | ↓ |

### **C. RBC Indices**

* **Mentzer Index = MCV / RBC count**

* > 13 → IDA
* <13 → Thalassemia trait

### **D. Others**

* Hb Electrophoresis → thalassemia/sickle
* Stool exam → worms
* LFT/RFT if severe

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## **8. Differential Diagnosis**

* Iron Deficiency Anemia
* Thalassemia trait
* Anemia of chronic disease
* Sickle cell disease
* Megaloblastic anemia
* Hemolytic anemia

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# **9. Management (Stepwise)**

## **Step 1: Confirm type of anemia (CBC + smear + ferritin)**

* If ferritin <30 ng/mL → IDA
* If normal ferritin + low MCV → thalassemia trait
* If macrocytic → folate/B12 deficiency

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## **Step 2: Treatment Based on Severity**

### **A. Mild to Moderate IDA (Hb 7–10.9 g/dL)**

**Oral Iron Therapy**

* **Elemental iron 100–200 mg/day**

* Examples: Ferrous sulfate 325 mg = 65 mg elemental
* Take on empty stomach ± vitamin C
* Avoid with tea/coffee/milk (↓ absorption)

### **B. Severe Anemia (Hb <7 g/dL)**

* **IV Iron** OR **Blood transfusion** (if near-term, cardiac failure, or Hb <5 g/dL)

### **C. Megaloblastic Anemia**

* **Folic acid 5 mg/day**
* **Vitamin B12: 1000 µg IM weekly × 4 → monthly**

### **D. Thalassemia trait**

* Avoid excess iron
* Genetic counselling

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## **10. IV Iron Therapy (Detailed)**

### **Indications**

* Intolerance to oral iron
* Malabsorption
* Hb <7 g/dL and stable
* Late pregnancy and need rapid correction

### **Common IV Preparations**

#### **1. Iron Sucrose**

* Dose: 200 mg IV per sitting
* Give multiple sittings until total requirement met
* AE: hypotension, nausea
* Safe in pregnancy

#### **2. Ferric Carboxymaltose (FCM)**

* Dose: Up to **1000 mg in a single sitting**
* Faster replenishment
* Less infusion reactions

### **Calculation of Total Iron Requirement**

`Total iron dose (mg) = [2.4 × (Target Hb – Actual Hb) × weight (kg)] + 500 mg (stores)`

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## **11. Blood Transfusion**

**Indications**

* Hb <5 g/dL (any trimester)
* Hb <7 g/dL + labor / imminent surgery
* Cardiac failure
* Severe symptoms with hypoxia

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# **12. Non-Pharmacologic Measures**

* Iron-rich diet: green leafy vegetables, jaggery, legumes, red meat
* Deworming (Albendazole 400 mg once after 2nd trimester)
* Treat malaria
* Birth spacing
* Cooking in iron utensils

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# **13. Drug Details (As Required by Your Pattern)**

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## **A. ORAL IRON**

### **Indication:** IDA

### **MOA:** Converted to ferrous form → absorbed in duodenum → used for Hb synthesis

### **Dose:** 100–200 mg elemental iron/day

### **PK:** Absorbed in proximal small intestine; excreted minimally

### **Common AE:** Nausea, constipation, black stools

### **Serious AE:** Very rare GI bleeding

### **Contraindications:** Hemochromatosis, hemolytic anemia

### **Drug interactions:** Antacids, tetracyclines, tea/coffee reduce absorption

### **Monitoring:** Hb every 4 weeks

### **Counselling:** Take on empty stomach; Vitamin C improves absorption

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## **B. FOLIC ACID**

### **Indication:** Megaloblastic anemia, prevention of NTD

### **MOA:** DNA/RNA synthesis

### **Dose:** 5 mg/day for anemia; 400 µg/day for prophylaxis

### **AE:** Rare rash

### **Interactions:** Anticonvulsants reduce folate levels

### **Monitoring:** Hb, MCV

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## **C. VITAMIN B12 (CYANOCOBALAMIN)**

### **Indication:** B12 deficiency

### **MOA:** DNA synthesis + myelin formation

### **Dose:** 1000 µg IM weekly × 4 → monthly

### **AE:** Flushing, hypokalemia early

### **Contraindications:** Leber hereditary optic neuropathy

### **Monitoring:** Reticulocyte response in 1 week

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## **D. IV IRON (FCM / Iron Sucrose)**

### **Indication:** Severe IDA; intolerance to oral iron

### **MOA:** Direct replenishment of iron stores

### **Dose:** Based on calculation

### **AE:** Hypersensitivity, hypotension

### **Monitoring:** Hb after 2–3 weeks

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# **14. National Programs (India)**

## **I-NIAP (Intensified National Iron Plus Initiative Program)**

* Daily supplementation:

* Pregnant women: **60 mg elemental iron + 500 µg folic acid** × 180 days
* Biweekly deworming
* Screening for anemia at each ANC visit

## **Anemia Mukt Bharat — 6×6×6 Strategy**

**6 Target beneficiaries** (children, adolescents, pregnant women, etc.)
**6 Interventions**

1. Iron–folic acid supplementation
2. Deworming
3. Behavior change communication
4. Testing & treatment
5. Intensified year-round IEC
6. Parenteral iron therapy

**6 Institutional mechanisms** (logistics, training, monitoring etc.)

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# **15. Iron Requirements During Pregnancy**

* Additional requirement ≈ **1000 mg total**
* Daily need = **4–6 mg absorbed iron/day**
* Dietary intake usually insufficient → supplementation needed

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